A motion mesh approach for fluid.structure interaction of spatial structures

Abstract

Mesh motion strategy is one of the key problems in fluid-structure interaction analysis (FSI). One popular technique which often used to solve this problem is known as the spring analogy method. In this paper a new mesh update approach based on the spring analogy method is presented for the effective treatment of mesh moving boundary problem,which can avoid the generation of squashed invalid elements and maintain mesh quality by considering each element shape and grid scale in the definition of the spring stiffness. Meanwhile, the approach is applied to several 2D and 3D boundary correction problems for fully unstructured meshes and evaluated by a mesh quality indicator. With this application, it is demonstrated that the present approach can keep good mesh quality even under large motion of bodie.s. Finally, the computational robustness of the present approach on is highlighted